For #2 (and maybe #3) see: http://www.w3.org/TR/SVG/implnote.html#ArcImplementationNotes
--- In [email protected], "tushar0711" <tctriv...@...> wrote: > > > Hello All, > > I'm developing basic SVG Viewer using .Net GDI+. I need to draw an > Elliptical Arc using SVG Path element. > > SVG <path> element has "A"/"a" command for elliptical arc which has > following parameters > > x,y = End point of the curve > rx,ry = X Radius and Y Radius of the entire ellipse > x-axis-rotation = rotation applied to entire ellipse > large-arc-flag = flag that determines whether to draw large arc or small > arc between given points > sweep-flag = flag that determines positive angle direction or negative > angle direction > > starting point of the curve is known > > Now, on the drawing/rendering side I have couple of options: > > 1. Drawing elliptical arc using one or more cubic bezier curves > > 2. Drawing elliptical arc using .Net DrawArc() method > > 3. Drawing elliptical arc by joining points on the curve using line > > For No. 1 what need is set of 4 points for each Cubic Bezier curve. If > anyone know any methodology/algorithm/formula or any other resource to > derived points of the bezier curve from the above given parameters > please share. > > For No. 2 what I need to know is rectangle that is equivalent to > bounding box of the entire ellipse, start angle and sweep angle. In > order to know the rectangle I need to know the center of the ellipse. If > anyone know any method/algorithm/formula to determine center of the > ellipse and start angle and sweep angle from above given SVG parameters > please share. > > For No. 3 what I need is simply set of points joining which by line I > can draw a curve. > > I'm not from the mathametics background, please share your knowledge on > this or direct me to any web resource where I can read relevant > information and formulas. > > Since this group is very old, this topic may be already discussed. If > so, please let me know message number(s). > > Thanks all > > Tushar > > > > [Non-text portions of this message have been removed] > ------------------------------------ ----- To unsubscribe send a message to: [email protected] -or- visit http://groups.yahoo.com/group/svg-developers and click "edit my membership" ----Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/svg-developers/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
